Debate around the Conor vs Khabib matchup has revealed to me that TDD as % is an unreliable stat when attempting to determine a fighter's propensity to be taken down. The reason for this is that it doesn't factor in a fighter's ability to control the distance and prevent an opponent from even attempting a takedown. Good strikers often cause good grapplers to be more cautious in their TD attempts to avoid the risk of incurring damage from strikes. A significantly more useful stat is takedowns allowed per minute. This number uses a fighter's minutes competed and total times taken down to create a stat that shows TD allowed per minute. It captures a fighter's ability to fend off attempted takedowns AND avoid takedown attempts. Using data from Khabib's UFC opponents, you can see that Conor's TDAPM is better than all but four of Khabib's opponents. If you throw out the Mendes fight (given Conor's knee issues) Conor's ability to avoid the taken is better than all but one of Khabib's opponents. If my thesis is accurate, you'll see Khabib struggle to secure takedowns on Conor when they fight. I'd love to see data presented on other fighters so please feel free to do some research and share.